It’s been one month since 20-year-old Mollie Tibbetts disappeared from Brooklyn, Iowa and her father, Rob Tibbetts told KCRG-TV9 he has made the difficult decision to head back California.Mollie Tibbetts was last seen jogging at about 7:30 p.m. on July 18. She was dog-sitting at her boyfriend’s house when she disappeared.Since her disappearance, investigators have run down more than 2,300 tips and conducted numerous searches by land, air, water and using K-9s, but have found no trace of the University of Iowa student.