Charles Sweetwood, 53, was found dead in his Redding, California, apartment on May 7, 2013. Authorities determined he had been killed by a single gunshot wound to the back of his head and that the murder occurred on May 1, 2013. His body was discovered by his daughter.

The original investigation by the Redding Police Department identified Matthew Wade Hartman and Carleen Annette Honaker as potential suspects, but investigators said there wasn’t enough evidence to arrest anyone and the case grew cold after about seven months. Investigator Rusty Bishop later reopened the file and pursued additional testing and evidence that investigators say strengthened the case.

Bail was set at $1 million for each. What details about that May 1 timeline or the evidence would help explain how the case went cold and was later revived?