horror movie help

[The catcher in the rye]

Hello.
please can someone help me find out a name of a movie i watched back in the 80's when i was a kid
all i can remember is one scene that takes place in a shop where a girl goes over to see her boyfriend lying on the floor behind one of the shopping ailes asking for her help, and when she goes over to him, the killer in the movie- i think he is a cop/sheriff has cut off her boyfriends head and is using it as a puppet.
sorry its not alot to go on.

[illdojo]

It's definitely The Gate.

[Ferox13]

Scott Speigal's THE INTRUDER: (http://www.imdb.com/title/tt0095379/)

http://xploitedcinema.com/catalog/images/dvd/night_of_the_intruder.jpg

[The catcher in the rye]

Hello.
thankyou to both answers, but the intruder sounds like it.
just looking at the poster/dvd cover for the movie im sure thats it, because i remember the killer has a moustache.
is this movie still available to buy?
thanks

[neverending]

Why don't you look and see?