Mystery Deepens in Case of Missing Pregnant Woman Erin Corwin

Authorities today continued their search for 19-year old Erin Corwin, who went missing at Joshua Tree National Park on June 28, amid speculation about the circumstances of her mysterious disappearance.

The mother of Erin's Marine husband Jonathan Corwin said she's particularity concerned about the attention that has focused on Jonathan.

"I know that it's everyone's first thought that it's the spouse," Sheila Braden told ABC News, "but if they knew John and Erin, and the relationship they had, they would know he's not capable of this."

Homicide investigators are leading the search after police announced last week that there were "suspicious circumstances" surrounding her disappearance.

The San Bernardino Sheriff's Department has not named any suspects in the case.

M ultiple users were blocked from Praying for Erin, the Facebook group aimed at spreading the word about Corwin's disappearance.

The group, despite being flooded with supportive messages, also attracted speculative comments from strangers, particularly about the husband. An update posted yesterday acknowledged the "suspicions, doubts, and questions," but asserted that "conspiracy theories" are not helpful.

San Bernardino County Sheriff's deputies say Lance Cpl. Jonathan Corwin reported his wife missing on June 29, a day after she was last seen leaving their home headed for the park. She is three months pregnant, police said.

Police helicopters and ground forces have spent the last week searching without any success. Some 50 volunteers searched over the holiday weekend.

Police located Corwin's 2013 Toyota Corolla in Twentynine Palms on June 30, but there was no indication of her whereabouts.

Anyone with information regarding Corwin is asked to contact the San Bernardino County Sheriff's Specialized Investigations Division-Homicide Detail at 909-387-3589, or Sheriff's dispatch at 909-387-8313.

Erin wast last seen at 7 a.m. on June 28 on her way to Joshua Tree National Park