11:05 AM PT -- Law enforcement sources tell us Salling's body was found hanging from a tree.
10:45 AM PT -- We're told police received a call to do a "welfare check" on Salling and somehow that led them to the baseball field where his body was found. We're told Salling had been dead for some time.
Our sources say a family member came to the LAPD station at 3 AM Tuesday to report Salling as a missing person.
We're told homicide detectives are on scene to rule out foul play, but they say all signs point to suicide by hanging.
Mark Salling committed suicide by hanging, according to law enforcement ... TMZ has learned.
We're told his body was found near a riverbed in Sunland ... the area where he lived. Law enforcement tells us Salling was hanging from a tree.
The former "Glee" star was awaiting sentencing after pleading guilty to possession of child pornography involving prepubescent minors.
Prosecutors say he had 50,000 images of underage children.
Sentencing in the case was set for March. He was expected to get 4 to 7 years in prison as part of a plea deal.
Salling was 35.