Slasher movie with killer who strangles with roll of film

An English pianist living in Rome witnesses the brutal murder of his psychic neighbor. With the help of a tenacious young reporter, he tries to discover the killer using very unconventional methods. The two are soon drawn into a shocking web of dementia and violence.

After a young girl is accidently infected with an alien substance known as "Deep Red", the astonishing results attract the attention of the illustrious scientist Dr. Newmeyer. Disillusioned security expert Joe Keyes must team up with his estranged wife to protect the girl and her mother from the obsessed scientist who will stop at nothing to get what he wants.

Short horror film.

A psycho serial killer is stalking potential victims that he butchers and dismembers to make his ultimate snuff film.

A film cast arrives at a wrap party, but someone has dressed up as the slasher in the movie and begins to stage their own kill scenes. One by one, the cast disappears until the true nature of the evening is revealed.

A night janitor watching a slasher movie on TV is stalked by a mysterious masked killer who he can see the location of on his own TV.

A b-movie actor goes a bit nuts after one too many bad roles, strangling all the actresses he's worked with prior.