Extract all unique names from the provided paragraphs separated by comma.

Neville shows to Det. Delroy a recently shot love scene between Keefe and Elaine, willingly pointing out a spousicide-related detail which compromises the already delicate position of the young widower. In light of this new evidence, Delroy tells the director that he will arrest the young man very soon. Neville telephones Keefe to warn him, telling him to come to his house at a certain time. The director also calls Elaine to his home, where he attempts to recreate the night of Andrea's murder, this time using Elaine. Det. Vickers watches Elaine enter the director's house from the street, but he misses Keefe, who breaks in through a window. He disrupts the liaison by pulling plug fuses out of the breaker box, shutting off the lights. Detective Vickers notices the lights shut off from the street and unsuccessfully tries to break in. In the house, Neville attacks Keefe with a pair of scissors, and the two struggle. Keefe throws Neville over a balcony, and he lands in an indoor fountain below together with a light. Simultaneously, Elaine restores electricity to the house, unknowingly electrocuting Neville to death.

Neville, Delroy, Keefe, Elaine, Andrea, Vickers