Amy Bishop, ex-Ala. professor sentenced to life for shooting rampage, wants to be tried in brother's 1986 death

In this Sept. 11, 2012, file photo, Amy Bishop, accused of killing three and injuring three others in a Feb. 12, 2010 shooting at the University of Alabama in Huntsville, walks into a courtroom at the Madison County Courthouse in Huntsville, Ala. Bishop pleaded guilty to capital murder charges in an agreement that will send to her prison for the rest of her life and make her ineligible for the death penalty. A judge scheduled jury selection for Monday, Sept. 24, 2012, as a trial is still required under Alabama law because Bishop admitted to a capital charge of murder.
AP Photo/The Huntsville Times, Eric Schultz, File
Amy Bishop walks into a courtroom at the Madison County Courthouse in Huntsville, Ala.
Eric Schultz, File,AP Photo/The Huntsville Times

(CBS/AP) BOSTON - Amy Bishop, the former University of Alabama-Huntsville professor sentenced to life for killing three colleagues in a shooting rampage, wants to go on trial in the 1986 death of her brother.

Pictures: Amy Bishop gets life for U. of Ala. shootings

Bishop's lawyer filed court documents stating that she objects Norfolk District Attorney Michael Morrissey's decision to decline prosecuting her in the killing of 18-year-old Seth Bishop.

Attorney Larry Tipton said Amy Bishop wanted to prove at trial that she had a "loving and caring relationship" with her brother and that the shooting was accidental.

"She wants to use a trial to help demonstrate that she's innocent. She never intended to kill her brother," Tipton said Tuesday.

Morrissey said last week that he decided not to move forward with the murder indictment against Bishop because she already received a life sentence without parole in the 2010 Alabama killings.

"The penalty we would seek for a first-degree murder conviction is already in place," he said.

Bishop claimed she accidentally shot her brother while trying to unload her father's shotgun in the family's Braintree home. Bishop's mother, who witnessed the shooting, backed up her claim.

Authorities initially ruled the shooting accidental, but the investigation was re-opened after Bishop was charged with opening fire during a faculty meeting at the university in Feb. 2010, killing three of her co-workers and wounding three others.

Complete of Amy Bishop on Crimesider