A 2-year-old boy from Indiana found in a next-door neighbor's fish pond was declared a victim of drowning, authorities said on Tuesday.

An autopsy revealed that Carter Pickerell had drowned after falling into the koi pond, according to a release from the Vanderburgh County Coroner. His father reportedly called police on Monday to report him missing.

"There's no way he could've got out," the man said in a 911 call recording obtained by the Courier & Press. "I've checked the whole house, the basement, everything. I've been yelling his name."

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Roughly six minutes later he was located as police stayed on the line.

"We've found him in the pond of the next-door neighbor's house, and we're trying to do CPR right now. We're getting some water out, but I don't know," an unidentified woman said, according to the paper.

Paramedics and firefighters were called to the scene around 3:45 p.m. where they tried to resuscitate the boy at the residence located roughly 170 miles southwest of Indianapolis.

"All lifesaving efforts were unsuccessful," the Evansville Police Department said in a news release.

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The boy's father told the paper he left Pickerell for a moment to get socks from another room in the house, but the child was gone upon his return.

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The department is investigating the boy's death. Detective Sergeant Peter DeYoung said that no criminal activity was suspected.

The Associated Press contributed to this report