MGM Resorts has released surveillance footage of Stephen Paddock's last days before the October 1st shooting.
Paddock is seen behaving relatively normally; buying food, gambling, joking with employees.
However, as the NY Times reports these actions were sinister in nature:
Watching the footage, nearly six months later, is a kind of compulsive ghost-hunting. In the antiseptic stare of the surveillance camera, even the most ordinary interactions are deformed, made weird only by what we know now. It is unnerving because it ends in the deadliest mass shooting in modern American history. It is unnerving because even with his every movement laid out, the grotesquely composed protagonist of this film gives away nothing.