LAKEWOOD RANCH -- The Florida Highway Patrol has concluded that an Oct. 10 crash that killed two Lakewood Ranch teens was caused by the driver drinking and driving, according to a report released last week.

Investigators concluded the driver, Brendan T. Shreve, 17, was driving under the influence of alcohol and speeding before the crash at 5:05 a.m. on Lakewood Ranch Boulevard. It killed him and the only passenger in his car, Jared S. Duran, who troopers said had also been under the influence of alcohol.

According to FHP, Shreve was at the wheel of the 2012 Mercedes C350 when the car missed a turn, jumped the curb and slammed into a tree in the median north of Clubhouse Drive just minutes from the boys' homes.

The impact split the car, with the rear traveling 50 feet southwest from the tree and the front going southeast 165 feet.

Sign Up and Save Get six months of free digital access to the Bradenton Herald

Shreve and Duran had left Shreve's girlfriend's father's house and Shreve was going to drop Duran off at home, troopers said. There were no adverse weather conditions at the time and Shreve's girlfriend told investigators he was familiar with the route.

The girlfriend also told investigators that Shreve arrived at her home with seven cans of Four Loko, an alcoholic beverage sold in 16-ounce cans with about 8 percent alcoholic content. She said she saw both Shreve and Duran consume one can apiece, and that they had gotten the cans from an "unknown friend."

The girlfriend said there were no adults in the home while the teenagers were drinking and that she didn't believe Shreve had ever driven drunk. She said Shreve "drinks a lot," but it depended on how much he could obtain, according to the report.

Shreve said he had to be home at 5 a.m. and he and Duran left the home at about 4:50 a.m. Duran also sent out a Snapchat video that troopers reviewed that showed Shreve driving with his seatbelt on.

Duran's parents told investigators that Duran was grounded and they believed he was home in bed at the time of the crash. A trooper and Duran's father walked into Duran's bedroom and found pillows under his bedding arranged to look like he was still in bed.

The speedometer needle was stuck at 80 mph when investigators examined the wreckage, but the actual speed reportedly was at minimum 64 mph and likely more than 113 mph based on the extent of damage to the vehicle, according to the report. The road's speed limit is 35 mph.

Blood samples taken from Shreve and Duran revealed their blood alcohol levels were .095 and .097, respectively. The legal limit in Florida is .08 for those 21 and older and .02 for those under the age of 21.

Later, teenagers gathered at the tree to mourn. Friends set up Go Fund Me accounts to help the families pay for funeral expenses.

A makeshift memorial in the median of the roadway for the two teenagers raised safety concerns in December, according to past reports by the Herald. Supervisors for Community Development District 1 are moving forward with a plan to install a memorial bench for the two teens, as well as Donald Mader, 83, who was struck and killed by a motorist while riding his bicycle in the same area in 2014.