Mariah Leitner is the wife of Pete Leitner.
At the wedding, Schneider gave a toast where he brought up his and Pete's exploits in Tijuana in 2009. Mariah, hearing the moans of Pete's United States Navy colleagues about the incident, looked at her new husband uncomfortably.
Unknown to the attendees of the wedding, the wait staff were agents of HYDRA who spiked the champagne with a chemical to duplicate the effects of the Diviner. Mariah, who drank the wine, screamed as Schneider fell from the podium dead. Mariah suffered no ill effects from the drink. 
- Pete Leitner - Husband