The frantic 9-1-1 call made from Heather Locklear’s Westlake home around 2:30 p.m. PST on Thursday was made by her older sister Colleen and RadarOnline.com has exclusive details about why it was made.

“Colleen was worried about Heather’s state of mind and they were afraid she was going to harm herself,” a source told RadarOnline.com.

“She was afraid Heather was going to harm herself because of her drinking mixed with medication.”