Alan Greenawalt can't help but wonder, if his mother and sister should still be alive.

"The way I feel about it, honestly…I feel like he should have been caught sooner." said Greenawalt.

Last month, 59-year-old Regis Brown pled guilty to murdering Alan's mother Michelle Brown, 53, and his 35-year-old sister Tammy Greenawalt, inside of their Fairview Township home.

Brown confessed to killing his wife and stepdaughter in front of Brown’s 14-year-old granddaughter, who he then tied to a bed for days.

Brown was sentenced to life in prison without the possibility of parole, plus an additional 40 years.

"At first, he was a good father figure, to be completely honest,” said Alan Greenawalt.  “Then, as the years went by, things got worse and worse.  We just didn't expect this type of outcome."

Brown had been the suspect in the 1988 murder of 45-year-old Bryce Tompkins of New Castle.

According to the criminal complaint, PA State Police had been monitoring Brown for the past 10 years, but lacked sufficient evidence to charge him.

After his arrest for double murder in Fairview, investigators say Brown admitted his to full involvement in Tompkins’ death, and charged him with an additional count of murder.

"I feel bad for that other family, because they've been going through it a lot longer than we have,” said Alan Greenawalt.  “I feel for them."

On Thursday, Pennsylvania State Police said that they now believe that Brown is connected to six to eight homicides across Pennsylvania.

"I just wish things were different,” said Alan Greenawalt.  “Whatever he gets, he gets.  He deserves it."

With Brown facing additional charges, for Alan and his family, the question remains.

"I'd like to know why?” said Alan Greenawalt.  “My mom and my sister were the biggest supporters that he probably ever had in his entire life, and to take their lives, it doesn't make sense."