Bad Dads

In January of 1983, a man abandons his pregnant wife. In February, the wife gives birth to a set of twins.Thirty-two years later, on of the twins is murdered while attempting to locate the wayward father.
Who would kill this man?
The footloose father?
The sleazy lawyer?
The twin’s ex-wife?
The best friend?
The religious cult leader?
The distinguished professor?
All of the above?
None of the above?