This is the same movie as Dragon Fire

I do not mean similar. This is the same script shot with diffent actors.

A man wins a underground fighting tournament and is killed while celebrating. His money and jacket are stolen by a homeless man.

The next day his brother arrives in 2050 Las Angeles and is mugged. A shady character named Slick saves him. And tells him that his brother was killed. Slick promises to help him find the killer, bit he must enter the same underground fighting group as his brother.

Slick finds him a spraring partner who's sister is a stripper. He enters a relationship with her.

The homeless man is killed and Slick tells our main character that the best fighter "Ahmed" is the killer, but it turns out Slick is the real killer.

This is the plot of "Dragon Fire" from 1993 written by the same guy that wrote the first Bloodfist movie.