the main suspicious things to me are how long it took to find the body and the fact that there were "no signs of injury". i guess this would point to a drug overdose if it turned out to be mental health related?

the penn's neck ping and "no signs of mental health issues" comment do not necessarily throw me off; it's not uncommon for suicidality to go unnoticed (often others' unawareness contributes to the pain). having been suicidal myself, i remember going on long walks/ignoring people's calls when contemplating the deed, which seems to match the timeline of the story.

i do hope a proper investigation is done however if there is any hint of foul play