There's only one photo, I believe. And it only came to light years after the murder after they had arrested Sigfredo and Luis and were working backwards to connect them to the Adelsons. Also, the cops already learned from Jeffrey Lacasse that Wendi and Katie knew each other. But Wendi knew a lot of people. So, that in itself wasn't the issue.
My point was that if the cops could prove that Wendi and Katie were conversing around the time of the murder, it would have been easy to follow the trail to Katie's on-again, off-again boyfriend and his Latin King best friend. And it would be pretty definitive evidence that Wendi was aware of the hit.
But yeah, allowing someone to take that photo was an unforced error on Wendi's part.
Video Police find link between Markel’s alleged killers and ex-wife’s family: Part 6
Katherine Magbanua has two children with one of the men implicated in Dan Markel’s murder. Police discovered that she had received payments from the family of Wendi Adelson, Markel’s ex-wife.
abcnews.go.com