Plot Holes (Spoilers)
1. When the grandmother fell down the stairs and died, the police would check everyone out. The caretaker would not pass the scrutiny.
2. When the caretaker killed the bartender, wouldn't the girl notice it on the news or in the newspaper?
3. You cannot choke a healthy man to unconsiousness without a struggle and
leaving injuries to the neck. It would be impossible to fake a suicide.