Dominic Monaghan and Gary Oldman are joining the cast of Doug Rath's indie Monster Butler. Malcolm McDowell is already attached to star.

The film is a true story that follows Roy Fontaine, a bisexual serial killer, who chronicles his journey into darkness.

Gary Oldman is playing Wiggy, a taxidermist with a temper and business on the side who partners with Roy Fontaine on a number of crimes before things get heavy. Dominic Monaghan will play David Wright, a key player in Roy's life. Their relationship begins in prison and restarts when they both work on an estate. But a blackmail attempt forces Fontaine's hand and begins his descent into murder and mayhem.

Dark House Films is shooting for a June 6 start to production of Monster Butler in Scotland.