The Boogeyman (2013)

1 year after Lester Billings is accused of brutally murdering his 3 infant children,Lester visits renowned psychiatrist, Dr Harper. During the session, Harper is told the truth about the deaths of Lester's 3 children. With the clock ticking, Harper must determine if Lester really did kill his children, or if it was, as Lester puts it, The Boogeyman. But the truth is only the beginning of this nightmare.

Unfortunately the movie The Boogeyman is not yet available on HBO Max.