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Who had brought suspects to these interrogation rooms for years was allowed to see her son alone. >> all i could do was hold him. i just felt extremely helpless. >> reporter: whatever they talked about, donna wouldn't tell detectives. isaiah stopped talking, too. but police were convinced they had the right suspect. they charged isaiah with two counts of murder and one count each of robbery and obstructing justice. but when the trial began in the summer of 2018, prosecutor michael perry knew that proving the charges would be difficult. his case against isaiah was largely circumstantial. >> thi...

Heather collins became less hopeful. there was no direct evidence tying isaiah hagan to her daughter's murder, no gun, no dna, no eyewitnesses, nothing to prove isaiah was a killer. >> i was at the point where i was prepared for him to be walking the streets. >> prosecutor michael perry urged patience. >> we knew that we did not have enough evidence to convict at that point, but that's why you go to the end. >> there was one person in particular he wanted the jury to hear from, donna hagan, isaiah's mom. the prosecutor had no idea what she'd say on the stand, but he had reason to believe isaia...

Tracks. >> reporter: and the prosecution presented perhaps the most explosive piece of evidence they had, what investigators found when they searched the home of wandel and donna hagan. >> we were able to locate a towel from that home that was actually the same make, the same model of the towel that was located at the soccer field. >> reporter: and there was something else investigators discovered. wandel owned several guns, but one of them was missing. did you think that maybe isaiah took it? >> it wouldn't be something that we would suspect because he -- >> he didn't like guns. >> didn't lik...

>> i am getting emotional. i'm sorry. >> the defense attorney on the other hand got straight to work. he needed a new plan to save his client. when court reconvened he called dona hagan back to the stand. his goal, to show the jury that she couldn't be believed. >> on cross-examination she admitted that she believed that if the jury heard that isaiah said it was an accident then they couldn't convict him of murder. >> so you think that perhaps his mother in said these things so that her son could get perhaps a lesser sentence? >> well, yes. >> the problem is the genie is out of the bottle. >> ...

Jury, but the damage was done. it only took the jury four hours to find isaiah hagan guilty on all four counts against him, including murder. >> that's the most relief i've felt since it all happened. i felt like a huge weight was lifted off of me, because all i wanted forever was to just get justice for her. i wanted her to know we were doing our best to give her some piece, and the fact that we finally did it felt really good, and i just remember crying, and i couldn't stop crying. it was a lot of happy tears. >> but the haguens were angry. they didn't believe isaiah should have been convict...