cisco. tomorrow starts here. the high priced prostitute accused of injecting a google executive with a lethal dose of heroin then left him to die may have struck before. investigators are taking a closer look at the death of alix tichelman's former boyfriend who also died after a violent incident with tichelman. dan simon has the story "outfront". >> reporter: when he died from a heroin overdose last september. >> my boyfriend overdosed or something. like he's -- he won't respond. >> reporter: it appeared to be a tragic accident. his girlfriend made the call to 911. >> okay. and why do you think it's an overdose? >> because i've got -- there's nothing else it could be. >> accidental or intentional? >> i think definitely accidental. december. >> reporter: that was the story from alix tichelman and the case