Officer who shot NY student faced harrowing choice

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In this photo copied from the 2010 Sleepy Hollow High School yearbook, high school student Andrea Rubello is shown. Police said Rubello, a junior at Hofstra University in Hempstead, N.Y., was shot and killed Friday, May 17, 2013, during a break-in near the college campus. (AP Photo/Sleepy Hollow High School)

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Officer who shot... In this photo copied from the 2010 Sleepy Hollow High School yearbook, high school student Andrea Rubello is shown. Police said Rubello, a junior at Hofstra University in Hempstead, N.Y., was shot and killed Friday, May 17, 2013, during a break-in near the college campus. (AP Photo/Sleepy Hollow High School)
Minaj wins, Mars... Jennifer Lopez arrives at the Billboard Music Awards at the MGM Grand Garden Arena on Sunday, May 19, 2013 in Las Vegas. (Photo by John Shearer/Invision/AP)
Weeklong traffic... A derailed Metro-North rail car is hoisted back on to the tracks in Bridgeport. Conn. on Sunday, May 19, 2013. Crews will spend days rebuilding 2,000 feet of track, overhead wires and signals following the collision between two trains Friday evening that injured 72 people, Metro-North President Howard Permut said Sunday. (AP Photo/The Connecticut Post,Brian A. Pounds ) MANDATORY CREDIT
AP PHOTOS: Colle... People sit in the rain and listen as President Barack Obama delivers the 129th commencement speech at Morehouse College Sunday, May 19, 2013, in Atlanta. In a soaring commencement address on work, sacrifice and opportunity, the President told graduates of the historically black college to seize the power of their example as black men graduating from college and use it to improve people's lives. (AP Photo/John Bazemore)
How the Conn. tr... Metro-North employees work at the site of Friday's train derailment in Bridgeport. Conn. on Sunday, May 19, 2013. Crews will spend days rebuilding 2,000 feet of track, overhead wires and signals following the collision between two trains Friday evening that injured 72 people, Metro-North President Howard Permut said Sunday. (AP Photo/The Connecticut Post,Brian A. Pounds ) MANDATORY CREDIT
Official: Va. dr... Hiker "Quinoa" talks about being given credit for saving the lives of Carson Balckburn, Dalton Thomason, and Faith Ritchie after he ran them and others off the road with a water gun during a festival parade in Damascus, Va., Saturday, May 18, 2013. Just as the children ran off the street, a car came down the road and struck several people. (AP Photo/Bristol Herald Courier, Earl Neikirk)
Officer shot in ... MBTA Police Officer Richard Donahue smiles with his wife, Kim, during an interview at Spaulding Rehabilitation Hospital in Boston's Charlestown section, Sunday, May 19, 2013. Donahue almost lost his life after being shot during the crossfire with the Boston Marathon bombing suspects in Watertown, Mass. (AP Photo/Elise Amendola)
AP CEO calls rec... In this Sunday, May 19, 2013, photo provided by CBS News, Gary Pruitt, the President and CEO of the Associated Press, discusses the leak investigation that led to his reporters' phone records being subpoenaed by the Justice Department on CBS's "Face the Nation" in Washington. Pruitt says DoJ's seizure of AP journalists' phone records was "unconstitutional", and that the secret subpoena of reporters' phone records has made sources less willing to talk to AP journalists. (AP Photo/CBS, Chris Usher)
Obama exhorts go... President Barack Obama receives an honorary degree from Robert Davidson, Chair of the Board of Trustees, partially visible, during the Morehouse College 129th Commencement ceremony, Sunday, May 19, 2013, in Atlanta. Morehouse is the historically black, all-male institution that counts Martin Luther King Jr. among its alumni. It is Obama's second graduation speech of the year. (AP Photo/Carolyn Kaster)
Fate of LA pot s... In this photo taken Tuesday, May 14, 2013, Medical marijuana prescriptions vials are filled at the Venice Beach Care Center medical marijuana dispensary in Venice, Calif. Los Angeles politicians have tried and failed for so long to regulate medical marijuana that it was only a matter of time before voters got a chance to control shops that have proliferated. Complicating matters, there are three measures on Tuesday's ballot that would allow sick people to get the drug, but either limit the number of shops, raise taxes or do both. (AP Photo/Damian Dovarganes)
Charlotte rememb... In this May 16, 2013, photo, Abdulah Salim, Jr. hold the photograph of his father Dr. Reginald A. Hawkins who was a prominent Charlotte civil rights leader, in Silver Spring, Md. In the spring of 1963, a Hawkins led 65 people on a four-mile march from an African American college to the center of Charlotte’s downtown. ( AP Photo/Jose Luis Magana)
Small Fla. city ... A woman prepares to choose her numbers on a lottery ticket Saturday, May 18, 2013, in the Chinatown district in Oakland, Calif. A record Powerball jackpot has climbed to $600 million, and lottery officials speculated the jackpot would continue to soar in the run-up to Saturday’s drawing. (AP Photo/Ben Margot)
Tea party looks ... FILE – In this May 16, 2013 file photo Rep. Michele Bachmann, R-Minn., chair of the Tea Party Caucus, center, speaks during a news conference with Tea Party leaders about the IRS targeting Tea Party groups on Capitol Hill in Washington. Shouts of vindication from around the country suggest tea party movement's leaders think it is getting its groove back. They say the IRS acknowledgement that it had targeted their groups for extra scrutiny is helping pump new energy into the coalition. (AP Photo/Molly Riley, File)
OJ Simpson lawye... O.J. Simpson and his defense attorney Ozzie Fumo confer during an evidentiary hearing for Simpson in Clark County District Court on May 17, 2013 in Las Vegas. Simpson, who is currently serving a nine-to-33-year sentence in state prison as a result of his October 2008 conviction for armed robbery and kidnapping charges, is using a writ of habeas corpus to seek a new trial, claiming he had such bad representation that his conviction should be reversed. (AP Photo/Ethan Miller, Pool)
NY 'frisk' judge... In this Friday, May 17, 2013, photo, U.S. District Court Judge Shira Scheindlin is interviewed in her federal court chambers, in New York. Scheindlin is the federal judge presiding over civil rights challenges to the stop-and-frisk practices of the New York Police Department. (AP Photo/Richard Drew)
What do we eat? ... In this photo taken April 3, 2013, nutrition scholar Prof. Barry Popkin, head of the University of North Carolina Food Research Program, points to an ingredient label while discussing his study, what foods Americans are purchasing in stores and eating, in his office at UNC-Chapel Hill. Popkin is leading a massive project of researchers who are creating a gargantuan map, something he calls "mapping the food genome." "We're interested in improving the public's health and it really takes this kind of knowledge," he says. (AP Photo/Gerry Broome)
White House insi... In this Sunday, May 19, 2013, photo provided by CBS News White House senior advisor Dan Pfeiffer speaks on CBS's "Face the Nation" in Washington. Pfeiffer was scheduled to appear on five Sunday news shows Sunday, where he stated no senior officials were involved in the decision to give tea party groups extra scrutiny by the IRS. (AP Photo/CBS, Chris Usher)
Money tangle: Th... Ousted IRS chief Steven Miller is sworn in on Capitol Hill, in Washington, Friday, May 17, 2013, prior to testifying before the House Ways and Means Committee hearing on the extra scrutiny the IRS gave Tea Party and other conservative groups that applied for tax-exempt status. (AP Photo/J. Scott Applewhite)
A look at why th... FILE – In this Jan.23, 2013, file photo U.S. Secretary of State Hillary Rodham pounds her fist as she testifies on Capitol Hill in Washington at the Senate Foreign Relations Committee hearing on the deadly September attack on the U.S. diplomatic mission in Benghazi, Libya, that killed Ambassador Chris Stevens and three other Americans. Republicans and Democrats began condemning each other's response to Benghazi within hours of the first shots fired. The issue has flared and dimmed ever since, revived by new testimony, reports or documents like newly released emails. (AP Photo/Pablo Martinez Monsivais, File)
1 winning ticket... Joe Fajardo poses holding his Powerball lottery ticket after buying it at a store Saturday, May 18, 2013, in the Barrio Logan neighborhood of San Diego. With the majority of possible combinations of Powerball numbers in play, someone is almost sure to win the lottery game's highest jackpot on Saturday night, a windfall of hundreds of millions of dollars — and that's after taxes. (AP Photo/Gregory Bull)
1 of 2 fires nor... Mike Whitaker, left, and Andrew Fullingim watch smoke from a brush fire from Lake Hughes in Castaic, Calif., Friday, May 17, 2013. (AP Photo/Santa Clarita Valley Signal, Jonathan Pobre) MANDATORY CREDIT, LOS ANGELES DAILY NEWS OUT