>> that was my dad. >> but across town in long beach, janos kulcsar wasn't so forgiving. uming. >> janos truly loved her. loved boring on obsession. unfortunately it takes two people to quit the relationship. and janos was just not going to accept it. >> and here in his little apartment, he prepared a secret plan to get her back. >>> coming up, an old pair of pants reveals new secrets. >> when i saw the report where he said there was dirt on the pants, that's when the light bulb went off for me. >> when "dateline" continues. i hope my insurance pays for it. can you tell me how much this will be? - [cashier] 67. - sorry. - wait, have you heard about goodrx? goodrx finds free coupons to help you save up to 80% on your prescriptions. - wow, i had no idea. - [announcer] goodrx, stop paying too much for your prescriptions. the first and only full prescription strength non-steroidal anti-inflammatory gel available over-the-counter. new voltaren is powerful arthritis pain relief in a gel. voltaren. the joy of movement. and now your co-pilot.. new voltaren is powerful arthritis pa