Murder 911 News Today

>> reporter: detectives mcdonald and szalbirak realized they needed to pay danielle dreher another visit. >> were going back to find out what is your intent? what is your involvement with this? >> coming up -- did someone have a million reasons to commit murder? >> there was a substantial amount of money that she was going to gain if sam turned up dead. >> when "dateline" continues. n. i think dentists will want to recommend sensodyne rapid relief because its clinically proven to work in 3 days....

>> exactly. its exactly like that. they were playing spy games. >> reporter: now it was up to mcdonald and szalbirak to find out if all those spy games somehow developed into a conspiracy to commit murder. >> i became very suspicious that she had a part in this homicide. >> reporter: detectives sat down with danielle and recorded interviews with her on three separate occasions. from the very first interview, danielle willingly acknowledged that she and michael had been tracking sam and dianne. >...

24 hours after sam dreher had been shot, his condition began to deteriorate rapidly. sams sister, cindy, was there when the family decided to take him off life support. >> i hated it. i thought of him like he was one of my children. i loved him that much. >> were you able to be with sam? were you able to hold his hand and say goodbye? >> i did. >> reporter: what did you say to him? >> i made him a promise that the people responsible for his murder would pay for it. >> reporter: the news of sams ...

Danielle had a storybook marriage. then one tragic afternoon their world came crashing down destroyed by a series of bullets and a senseless killing. as investigators began to dig, they realized not all was as it seemed. theyd entered a thorny maze of marital betrayal. heres andrea canning with "tangled web." >> sarasota, florida, the perfect backdrop for romance. beautiful beaches for long walks, gorgeous sunsets. and a slow rhythm of a gentle gulf tide. stories of love abound in this city by t...

Story book marriage and then one tragic afternoon their world came crashing down destroyed by a senseless killing. as investigators began to dig they realized not all is as it seems. they had entered a thorny maize of marital detrail. >> sarasota, florida, the perfect backdrop for romance. beautiful beaches for long walks or just sunset. stories of love abound in the city by the sea but not all have ended happily ever after like the one that unfolded here in the summer of 2012 when secrets, lies...

She did manipulate him. >> detectives realized they needed to pay danielle another visit. >> were going back to find out wh who was involved in this case. >> coming, did someone have a million reasons to commit murder. >> it was a substantial amount of money she was going to gain. >> when dateline continues. been damaged-its amazing. the way you triumph over adversity. and live your lives. thats why we redesigned humira. we wanted to make the experience better for you. now theres less pain immed...

Has been hurt. now back to dateline. >> 24 hours after sam had been shot his condition dee titerior rapidly. his family decided to take him off life support. >> were you able to be with sam and hold his hand and say good-bye? >> i did. i made him a promise that the people responsible for his murder would pay for it. >> the news of sams passing hit diane mcknight hard. >> i kept saying maybe theres some hope that he can survive this but when i heard that, i knew that i was never going to see him ...

Espionage. >> its exactly like that. they were playing spy games. >> now it was up to mcdonald to find out if all of those spy games somehow developed into a conspiracy to commit murder. >> i think its very suspicious that she had this. >> detectives sat down with danielle and reported interviews with her on three separate occasions. from the very first interview, danielle willingly acknowledged that she and michael had been tracking sam and diane. >> where did you put the tracker in the vehicle...

Being involved in sams murder. and cindy wasnt alone. >> do i believe that she was part of the murder scheme? yes. >> reporter: sarasota county lead homicide prosecutor, karen fraivillig, believed danielle manipulated michael to kill sam. >> shes a very manipulative person and she was able to manipulate michael minor, and theres a dead man because of that. >> reporter: the question now before the prosecutor, could she prove it in court? >> coming up -- will one lover betray another? >> we were h...

And thats exactly what happened. >> reporter: we asked danielle dreher to sit down with us for an interview. both she and her attorney declined. but during danielles interview with the detectives, she emphatically denied having anything to do with sams murder. >> i would never kill my husband. i would never kill another human being. >> reporter: and the man who pulled the trigger supported danielles claim of innocence, in no uncertain terms. >> ive acted on my own. i did. i did this all on my ow...