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>> we did consider that her husband made known that she was having an affair. >> where was? she >> there were no. answers >> nearly 30 years, 60 investigators, and it all kept coming back to one elusive suspect. >> he just very commonly said, i know how to get rid of a body, so it would never ever be found. >> him? murder something that could be done over -- >> it was basically an hour never situation. >> hello, welcome to dateline. when kathy had cole disappeared, police didn't know if they are dealing with a missing person case or cold-blooded murder. with little evidence to go on,...

Kathy heckel. he told his son that he needs to get a different ride to work. >> lo and behold he's arrested, what is i'd like to hear? >> in our thankfulness that we were getting somewhere. >> still a long way to go? >> still a long way to go. >> in many ways, the arrest of 65 year old loyd groves, was the easy part. legal maneuvering delayed his trial another three and a half years. for the defense, that delay gave their investigators time to poke holes in the prosecution's case. >> this case had holes you can drive trucks through. >> tom bruno and his wife amy where the defense team's invest...

Heckel." >> did he say anything? >> yeah. he told his son that he needed to get a different ride to work. >> so -- >> it really didn't faze him. >> lo and behold, loyd groves is arrested. what was that like to hear? >> inner thankfulness that we were getting somewhere. >> still a long way to go. >> yeah. still a long way to go. >> in many ways, the arrest of 65-year-old loyd groves was the easy part. legal maneuvering delayed his trial another three and a half years. for the defense, the delay gave their investigators time to poke holes in the prosecution's case. >> this case had holes you cou...