Defense attorneys filed a motion to have charges dismissed against Thomas Randolph, who was convicted in the 2008 deaths of his sixth wife and a hit man.
Joel Nunez-Cruz, 31, must serve at least 40 years of his sentence before he can be considered for parole as part of his agreement to plead guilty, a prosecutor said.
The shooting occurred at 5:04 p.m. in the 300 block of West Sahara Avenue.
Chris Brassard, 45, a worker at a large apartment complex on Flamingo Road, died from sharp force injuries while attempting to perform a welfare check.