Eegah (1962)

Roxy is soon kidnapped by Eegah and taken back to his cave while Tom searches for her. In Eegah's cave, Roxy is reunited with her father, who tells her that he has begun to communicate with the caveman and has developed a theory as to the creature's astounding longevity. When a frisky Eegah expresses what seems to be romantic interest in Roxy, her father, fearful that the creature may kill them both if he is rebuffed, suggests she put up with as much of it as she can bear. Eegah never tries anything too explicit, though, and Roxy even ends up giving him a shave before Tom arrives and helps the Millers escape. Crushed, Eegah follows them back to civilization, and a final confrontation ensues.

In the city, Eegah breaks into a restaurant and hotel, attracting the attention of the authorities. Eegah then makes his way to a pool where Roxy and Tom are partying. There the police catch up with him and shoot him. The film ends with Eegah floating dead in the swimming pool.