Fans and loved ones were shaken when it was announced that actor Lee Thompson Young had died, and even more so when it was revealed that Young took his own life.

And sadly, those closest to the 'Rizzoli & Isles' star may never know what drove him to suicide, because Young never left a note.

Young, 29, was found dead in his North Hollywood apartment, apparently from a self-inflicted gunshot wound after he failed to turn up for work on the TNT drama.

Law enforcement sources told TMZ that Young was last seen last Saturday (Aug. 17), which may be when he killed himself.

Sources say that Young did keep a diary, but that no entries that were found shed any light on why he'd take his own life, and those close to Young said he had no serious known issues.

Our thoughts are with Young's family and friends. Here's to hoping they can achieve closure and move on, and that Young may rest in peace.