In Plain Sight Season 4 Episode 13
Something Borrowed, Something Blew Up
-Ronnie comes back to Albuquerque to testify and Mary must be there, on Brandi's wedding day.
-A juror on the case is killed by the white supremacist gun runners Ronnie is testifying against.
-The gun runners attack the Marshals and Ronnie inside the courthouse. Mary doesn't sneak out when ordered but comes around from behind and manages to save everyone.
-Ronnie is again relocated to a high end location.
-Mark takes over Mary's wedding responsibilities until she can arrive. Unfortunately it's too late. Brandi's had a meltdown and has called off the wedding.
-Mary goes into premature labor at the wedding site. Marshall gets help and tells her everything will be OK.