Task: Question Answering
Input (English): Passage: Gangsters Nat Burdell and Brad Conley (Ewing Miles Brown) kidnap wealthy socialite Margaret Chaffee and, joined by gun moll Esther Malone, head for the San Gabriel Mountains to await the ransom they've demanded from Chaffee's father. That night, geologist Dick Cutler sees what he thinks is a meteor crash into the forest. But he doesn't see that out of the smoke from the impact emerges a beautiful glowing blonde female extraterrestrial in a skintight leotard who can kill by touch.
The gangsters hole up at Cutler's cabin. When the alien peeks through a window, Burdell orders Conley to go after her, but the alien kills Conley, his gunshots having no effect on her whatsoever. Burdell then goes out and runs into the alien himself. Although his gunshots are also ineffective, the alien walks away backwards, allowing Burdell to retrieve Conley's body. Back at the cabin, Cutler says that Conley died of "radium poisoning" and that by carrying his body, Burdell has taken a potentially lethal dose of radium and needs to get to a doctor before he dies.
Burdell decides they should flee that night, even though they'll have to navigate a dangerous mountain road in Cutler's headlight-less Jeep. But before they can leave, the alien smashes through the cabin's window. Everyone runs outside. The alien catches Malone and kills her. When the alien tries to grab Burdell, he quickly sidesteps and she tumbles down an embankment. Burdell wrongly thinks she's dead. Cutler and Chaffee have already run back to the cabin. Burdell demands that they leave at once. But as they drive off, the extraterrestrial stops them and kills Burdell. 
Question: What are the last names of the two people that drive off with Burdell?
Output (English): Chaffee.