Robert Interval makes his initial court appearance on June 8, 2017. He was held on suspicion of murder in the death of his girlfriend, Christine Mustafa. Maricopa County Superior Court

Police are preparing to search a landfill in an effort to recover the remains of a Phoenix woman who has been missing since May.

The landfill search is in the planning stages and the location will not be disclosed until the final plan has been approved, which is estimated to take another three to four weeks, said Phoenix police Sgt. Alan Pfohl.

Christine Mustafa, 34, was last seen on May 10 as she was leaving work at a Walgreens pharmacy and failed to show up to her shift on May 11, according to police.

Her live-in boyfriend, Robert John Interval Jr., 37, was arrested in early June on suspicion of first-degree murder, even though a body never was found and Mustafa remains missing.

Mustafa’s family told police she had been making plans to move out of her home and get an order of protection against Interval, court documents said.

Family members also told police the woman had grown fearful of the man, court documents said. Interval had also made threats about killing Mustafa, court documents said.

Interval told police officers soon after Mustafa’s disappearance that he and Mustafa had gotten into an argument, court records said. 

On May 12, police went to the home to do a welfare check on Mustafa’s 8-month-old daughter. Officers made contact with Interval at the front door, noting that he was carrying a loaded .40-caliber handgun, court documents said. 

When officers entered the residence, Interval told them that he needed to clean the front room and entry area of his house because his dog had defecated and urinated on the floor, court documents said.

Officers also noted that Mustafa’s car was at Interval’s home.

Police initially said publicly that Interval was “a person of interest” in the case before arresting him.

Interval is being held on charges of first-degree murder. His next court appearance is Sept. 25.

Mustafa’s family members did not immediately respond to a request for comment on the latest developments Wednesday.

However, in a Facebook post Wednesday, her sister, Beka Sue, acknowledged the police landfill-search plans and asked for support by attending court hearings for Interval and hearings involving custody of the child.

 “I’m just asking please, if you can, whether you knew her or not, if you can go out and support. We just need to show Robert, the court, everyone, we have not, and we will not, forget about Christine.”


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