Stanley A. Dellimore

Major Bill Cage is an officer who has never seen a day of combat when he is unceremoniously demoted and dropped into combat. Cage is killed within minutes, managing to take an alpha alien down with him. He awakens back at the beginning of the same day and is forced to fight and die again... and again - as physical contact with the alien has thrown him into a time loop.

Set in a futuristic world where humans live in isolation and interact through surrogate robots, a cop is forced to leave his home for the first time in years in order to investigate the murders of others' surrogates.