911 call before family slaying: 'Shawn, don't do it'

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(CNN) -- Before she was shot and killed, 14-year-old Shayne Bentler called 911 and told the dispatcher her brother was "going to do something," according to Iowa police.

Then a voice in the background said, "Shawn, don't do it," followed by the sound of a gunshot, a police complaint said. The caller screamed, "Shawn no!" before the line went dead.

Shawn Michael Bentler, 22, is being held on $2.5 million bond in the shooting deaths of his parents and three teenage sisters, police said. (Watch the community's shocked reaction -- 1:33 )

The five gunshot victims were found Saturday in the town of Bonaparte after one of the fatally wounded teenage girls placed a 911 call at 3:38 a.m., said Special Agent Jim Saunders of the Iowa Division of Criminal Investigation.

Bentler was arrested Saturday morning in Illinois on unrelated drug warrants.

Saunders said Shawn Bentler was charged Sunday in the deaths of his father, Michael Bentler, 53; his mother, Sandra Bentler, 47; and sisters Sheena Bentler, 17; Shelby Bentler, 15; and Shayne Bentler, 14.

Shayne Bentler placed the 911 call, Saunders said.

According to the complaint, the caller told the 911 dispatcher her brother was "going to do something."

The complaint says a voice is heard in the background saying "Shawn don't do it," followed by a sound in the background consistent with a single gunshot. According to the complaint, the call ends with the caller screaming 'Shawn no.' "

Authorities told The Associated Press they received a second 911 call at the same time from the cell phone of Sandra Bentler. That call went unanswered.

The complaint said a deputy who went to the house found the bodies and numerous shell casings.

Details of the slayings await autopsies being performed Sunday in Des Moines by the Iowa State Medical Examiner's office, but Saunders said all five died of gunshot wounds.

Shawn Bentler was arrested about 60 miles east of Bonaparte in Adams County, Illinois, on an outstanding warrant there for failing to appear in court on a charge of possession of drug paraphernalia, said Adams County Sheriff's Department Sgt. Bruce Harmon.

Bentler also was ticketed for failing to have auto insurance and for driving with a revoked license, Harmon said.

Bonaparte, with about 500 residents, is in southeast Iowa, near the Missouri state line.