Mark Yagala

At 11.30, Sandy made that last call to Michael.

At 11.30, Sandy made that last call to Michael.

At 11.30, Sandy made that last call to Michael.

Less than two hours later...

Less than two hours later...

Less than two hours later...

Police believe Michael and Chris were shot somewhere in these hills.

Police believe Michael and Chris were shot somewhere in these hills.

Police believe Michael and Chris were shot somewhere in these hills.

And it was Sandy Bentley who would provide police with the most significant clue. A phone number Michael gave her right before he left for the meeting.

And it was Sandy Bentley who would provide police with the most significant clue. A phone number Michael gave her right before he left for the meeting.

And it was Sandy Bentley who would provide police with the most significant clue. A phone number Michael gave her right before he left for the meeting.

And that phone number links to the man who may hold the key to solving these murders. Back in 2002, the strongest lead cops had was that telephone number Michael Tardio had left with his girlfriend, Sandy Bentley. It linked to a person who would play a central role in the investigation.

And that phone number links to the man who may hold the key to solving these murders. Back in 2002, the strongest lead cops had was that telephone number Michael Tardio had left with his girlfriend, Sandy Bentley. It linked to a person who would play a central role in the investigation.

And that phone number links to the man who may hold the key to solving these murders. Back in 2002, the strongest lead cops had was that telephone number Michael Tardio had left with his girlfriend, Sandy Bentley. It linked to a person who would play a central role in the investigation.

48 Hours has learned he's talking about Michael Jacobs, a convicted felon seen here in a 1999 mugshot after resisting arrest. People from the Garden of Eden nightclub told us he and Michael Tardio discussed selling the jewels. Police believe Jacobs brought Tardio and Mr. Big together for the million dollar deal.

48 Hours has learned he's talking about Michael Jacobs, a convicted felon seen here in a 1999 mugshot after resisting arrest. People from the Garden of Eden nightclub told us he and Michael Tardio discussed selling the jewels. Police believe Jacobs brought Tardio and Mr. Big together for the million dollar deal.

48 Hours has learned he's talking about Michael Jacobs, a convicted felon seen here in a 1999 mugshot after resisting arrest. People from the Garden of Eden nightclub told us he and Michael Tardio discussed selling the jewels. Police believe Jacobs brought Tardio and Mr. Big together for the million dollar deal.

Police say evidence shows that in the hours before the killings, there were multiple calls between the cell phones of Tardio and Michael Jacobs during the day and into the night. In fact, Jacob's cell phone showed activity in the area where Tardio and Monson went to meet, according to cops, Mr. Big, before heading up here into the Hollywood Hills.

Police say evidence shows that in the hours before the killings, there were multiple calls between the cell phones of Tardio and Michael Jacobs during the day and into the night. In fact, Jacob's cell phone showed activity in the area where Tardio and Monson went to meet, according to cops, Mr. Big, before heading up here into the Hollywood Hills.