The death of a former NFL linebacker who played for six teams the past three years, including the Chargers in 2013, was ruled a suicide, the Philadelphia Medical Examiner's office said Tuesday.

Adrian Robinson, 25, was found to have hanged himself Saturday evening in Philadelphia, east of his hometown Harrisburg, Pa. No further details surrounding his death were available for release, office spokesman Jeff Moran said.

Robinson had a months-old daughter and was due to play for the Hamilton Tiger-Cats of the Canadian Football League this year with hopes of one day returning to the NFL.

He did not accrue enough NFL seasons to be a vested veteran, so his family does not qualify for the financial assistance it would receive otherwise. His agent, Brian McLaughlin, set up a fundraising website through GoFundMe to raise money for Robinson's daughter.

"We ask that you please respect his family’s privacy during this difficult time, and especially keep his daughter Avery Marie in your prayers," Robinson's agency, Symmetry, said in a statement Sunday.

He was in San Diego for only a few weeks in 2013.

The Chargers signed him in November to replace injured outside linebacker Larry English. He was cut in December when Melvin Ingram was activated from the Physically Unable to Perform List. Robinson played two of three games in that span, seeing eight special-teams snaps.

Robinson also played for the Steelers, Eagles, Buccaneers, Broncos and Redskins.

Despite his brief tenure, the news nonetheless was stirring. Robinson is the third former Charger to take his own life recently.

Junior Seau, a retired linebacker, shot himself in the chest in May 2, 2012, while at his Oceanside home. Paul Oliver, a retired safety, shot himself in front of his wife and two sons on Sept. 24, 2013. Both were posthumously diagnosed with chronic traumatic encephalopathy, a progressive degenerative brain disease that has been linked to repeated head trauma.

The families separately filed a wrongful-death lawsuit against the NFL.

Seau was 43. Oliver was 29.