Investigators on Thursday said they were trying to trace the weapons found near the body of a man who shot two co-workers inside an Ohio State campus building before he killed himself.
Police said they were also looking into why Nathaniel Brown, a convicted felon, obtained his hands on two handguns, 10TV's Maureen Kocot reported.
During a news conference Thursday afternoon, Ohio State University Police said Brown fired nine shots during Tuesday's attack inside the OSU Maintenance Building.
Court records obtained by 10TV News showed that co-workers noticed a change in Brown's personality in the days leading up the violence, Kocot reported.
Brown, 51, was upset about getting fired from his custodial job, and a search warrant showed co-workers said his behavior started to change in the past month.
During the past week, co-workers said they noticed Brown was "increasingly quiet," and "withdrawn," Kocot reported.
SWAT officers searched Brown's north side home on Wednesday, where they found evidence that the shooting was premeditated, Kocot reported.
Investigators also found a note left to Brown's ex-girlfriend that read, "Donna, I'm sorry I let you down," Kocot reported.
A handwritten final will left all his belongings to his ex-girlfriend, ending with "Sorry Donna you take care."
Brown served time in prison in the 1970s and 80s for receiving stolen property, did not disclose that on his job application,
Students, faculty and staff gathered at Ohio Stadium on Thursday evening for a candlelight vigil to remember Larry Wallington, who died in the shooting, and wish Henry Butler a speedy recovery.
Wallington, 48, and Butler, 60, were both shot by Brown, 10TV's Kevin Landers reported.
Wallington was shot to death inside the maintenance building where he worked as a building services manager.
He had been employed with the university for 10 years, Landers reported.
Wallington supervised Brown, Landers reported.
Police said Wallington and Butler were targeted by Brown, because they both gave him a poor work evaluation.
Wallington was so well liked that professors who were on sabbatical e-mailed Ohio State University President Gordon Gee expressing their loss in the tragedy, Landers reported.
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March 11, 2010:
Ohio State Gunman Left Apology Letters
March 11, 2010: After Shooting, Gee Says Ohio State Will Look At Policies
March 10, 2010: Ohio State Searching For Answers After Campus Shootings
March 10, 2010: Ohio State Shooting Victim Could Leave Hospital Today
March 9, 2010: Former Co-worker Says OSU Gunman Threatened Him
March 9, 2010: Campus Alerts, Social Media Notified Students Of Shooting
March 9, 2010: Gunman Was Getting Fired From OSU Job
March 9, 2010: Ohio State Univ. Worker Shoots 2, Kills Self Inside Campus Building