He was already serving a life sentence at the time on a prior charge of first-degree murder and firing a firearm that caused death or serious damage.
Bobb and Luis-Conti were both sentenced to jail for aggravated sexual abuse of a minor under the age of 14, according to NBC Miami.
Watson gave a thorough description of the circumstances leading up to the murders in a letter to Mercury News.
He began by asserting that he had been transferred to the Corcoran prison after being reclassified to a lower-security category.
Once there, Watson was put with a convicted child molester in a room akin to a hostel. Uncomfortable, he told authorities he needed to be relocated because he was on the verge of being violent.
