What I remember was this movie was showed on FX. It had aliens or parasites per say. They entered the people and would make them “zombies”. At the end of the movie some older guys blows himself and the shed which is filled with all the aliens/ parasites and it blows up. Then at the end it shows that guy turned into one of them. He risked his life for some girl and guy.
Night of the Creeps
http://youtu.be/XW8F1boWgv0
If not night of creeps it could be Slither from 2006.
http://m.imdb.com/title/tt0439815/
The Warning?
Sorry, Without Warning (1980).