Name this early 80's sci fi/alien movie?

Question

I don't remember much about this movie but it's stuck in my mind and I would like to know what it is. I saw it on HBO in the early 80's, probably somewhere between 81 and 83. There is what I think is an alien that has some kind of weapon like a large throwing star that either attaches to or is embedded in his leg. He goes around killing people in a rural area, mostly at night. That's about all I remember. Help.

Answer 1

Could this be Without Warning?

A father and son go hunting in the mountains. Before they can begin hunting, which the son does not want to do anyway, they are killed by flying jellyfish-like creatures, which penetrate their skin with needle-tipped tentacles.

Some time later, four teenagers, Tom, Greg, Beth and Sandy, hike in the same area, ignoring the warnings of local truck stop owner Joe Taylor (Jack Palance). A group of cub scouts is also in the area; their leader (Larry Storch) is also killed by the alien creatures, while his troop runs into an unidentified humanoid and flee.

The humanoid alien is throwing the disc-shaped creatures. The following is a trailer where you can see it throwing them (contains spoilers on the fate of one of the characters):