Fadedcamo

Gunshot to the head in his house. There was no clue or warning in the show previously. This was basically done because Kal had an opportunity to go work with the Obama administration in the white house and decided to leave the show for it. But it ended up being very well written if shocking departure for the character. Many characters, including House, struggle with it for the rest of the season to try to find a reason or clues to his behavior.

Think OP is speaking more on the character's suicide.

Yea, after living in a not so great area in North Baltimore, I can attest that the streets often look like a garbage dump, even with trash cans a half block up the road. People just don't care.