'Golden State Killer' case: Lead investigator on how killer adapted his methods

"Me being a law enforcement officer, it was sickening, thinking that somebody would hide behind the badge and commit these types of attacks," Paul Holes told "20/20."
1:29 | 05/03/18

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Transcript for 'Golden State Killer' case: Lead investigator on how killer adapted his methods
What did you know about him to sort taking into the files what was his ammo what did he do. He always had a Masco he always had gloves on. And he typically would have a knife or some other weapon with him and he would basically be telling him do what I say RO kill you. He would make them buying their hands behind their back he would binder ankles what does he do an attack number sixteen. He would packs with the man in the house he's fallen himself in the press. He took on the challenge and said. I will show you I can attack with a man house and he changes his and a blow to accommodate this additional threat inside the house. So when he comes into the house. The couple was asleep in bed he'll wake them up there waking up to it may and again in a mask with gloves on. Flashlights shining in their rise. When there is a man present he always had a gun. And often times it put the gun in the flashlight for the victims can see I've got a guy you knew he was a former police officer. Yes help alarming was that. The being a law enforcement officer it was sickening. Thinking that somebody would hide behind the badge and commit these types of attacks that is about as duplicitous. That you could possibly imagine. So that was very alarming and especially considering now you're hunting a guy that has the law enforcement training. Behind.

This transcript has been automatically generated and may not be 100% accurate.

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