His accomplice, Alexis Vila Perdomo, 48, a former professional MMA fighter and Olympic medalist, was sentenced to 15 years in prison for conspiracy to commit kidnapping and/or murder.
According to investigators, Vila Perdomo and Isaac were two-of-three men hired by Manuel Marin to kill Salazar, who was having an affair with his wife Jenny Marin.
A third man, Ariel Gandulla, a former MMA training partner of Vila Perdomo, faced similar charges as Isaac and Vila Perdomo.
State prosecutors reduced his sentence to 36 months after he agreed to testify against Vila Perdomo and Isaac.
Vila Perdomo was in Las Vegas, cellphone records indicated, though call records revealed several calls to him, and between all four suspects throughout the day.