Art in the Blood
Fourth in the Vampire Files series by P.N. Elrod...
This'll be short I think since these are fun plot-driven books that so far haven't had a lot else going on. Which is ok, a person needs that now and then.
Jack ends up befriending an artist and then investigating when the artist's friend/almost love interest shows up dead. Said artist's wife having died of a suspicious suicide a while back making him the main suspect in the current murder.