Here’s the story, from TMZ:

This is the craziest story ever. The woman who called 911 on Heather Locklear is a former Us Weekly staffer who was under investigation by the FBI — and she’s the one who tipped off the paparazzi!

Jill Ishkanian, who allegedly hacked into Us Weekly’s computer system to locate celebs after she left the mag, was following Locklear in the Montecito area. Ishkanian watched the actress go to a market. When Heather got in her car, Ishkanian called 911, even though the car wasn’t even moving at the time.

Now get this — sources say immediately after Ishkanian called 911, she called a paparazzi agency to give them the heads up Heather was about to be popped. TMZ obtained those photos, not knowing it was Ishkanian who set the ball in motion.

And it gets worse. Ishkanian apparently is the only witness who says Lockelear was driving erratically and that she was drunk, even though it’s already established she was not under the influence of alcohol.

Sound underhanded? That’s what we’re thinking …

Update: CHP sources in the office investigating the Heather Locklear case tell TMZ the motives of the woman who called 911 are irrelevant — and we’re now told there are other witnesses who will back up her story. The case is now in the hands of the prosecutors.

One CHP official told us that up until we posted our story last night, they were unaware that Jill Ishkanian — the woman who called 911 — had called a paparazzi agency immediately after she made the emergency call. But the official says it has no bearing on the case. He told us the case file has already been referred to the Santa Barbara County D.A. and it’s being reviewed right now. He added the decision on whether to prosecute will be based on the results of drug testing — due in around three weeks.

The official says since the arrest, the CHP has received calls from other people who tell the same basic story Ishkanian told. He says Ishkanian went to the cop shop on Saturday night and gave a written statement of what she saw and also told her story, which is on tape. He added, “There’s no reason to believe the witness is less than credible.”