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Espionage. >> it's 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 it's 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? >> i put it up under the driver's side rear wheel and i have been tracking him for about a month...

>> 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. >> where did you put the tracking device on the vehicle? >> i put it up under the driver's side rear wheel. >> okay. >> and i've been tracking him for about a mont...