The latest body was found in a detached garage during a search warrant at a home on Church and Curtis Avenues early Tuesday morning.
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The body, described as a man in his 40s, has not been identified, but authorities said it appears there was some trauma.
Police say the body was found next door to the home where 81-year-old Billy Bonds, 44-year-old Lupe Bonds, and a third person were found dead on Saturday morning.
Officers also served search warrants at a home in Parlier and another house in Selma, where two vehicles were impounded.
Three people at the Reedley home were taken in for questioning, including a woman in her 30s, a man in his 20s, and a teenage boy.
RELATED: 81-year-old and 44-year-old found dead at Reedley home identified
Lupe's family members showed Action News the backyard of the original crime scene earlier this week.
They pointed out a hole that had recently been dug, and a tarp was found next to it.
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The family says the discovery points to possible signs of a shallow grave where the first three victims were going to be buried before police were called to the property for reports of a burglary.
The community and victims' families still trying to make sense of this tragedy.
"I just wish I had my family back. I miss them so much. They were great people, and they're totally gonna be missed very, very much. It's just awful that they go like this. It's not fair," said Cheryl Moseley, Billy's niece.
Police have been searching for Guadalupe's husband, Matthew Bonds.
They are not yet confirming if the body found this morning could be his.
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