>> ari had been working on a diesel truck fuel filter. but tests showed there was an accelerant on ari's clothing more flammable than diesel fuel. >> some red flags were going off i think for our detective bureau certainly. >> it was consistent with like a gasoline type which would have been more of a lighter petroleum product. >> when investigators looked into ari's personal life, friends said there was no love lost in the squires' childless 14-year marriage. >> they did not sleep in the same bed. when i did get to the house, i did see that it was obvious that both beds had been slept in that night. >> it wasn't really a close knit marriage. that was coming out very clearly. >> even more suspicious, ari had $5 million worth of life insurance and ari's wife denise was the sole beneficiary. but when questioned by police, denise claimed she knew nothing about it. >> so we began to try to find