Buskirk said he handcuffed Wolfe behind her back as Crosley taped her mouth shut and taped her legs up with duct tape, according to the affidavit.
Wolfe fought back, Buskirk said in the affidavit, trying to bite the men. Crosley put his white shirt over the teen's head, duct taped her around her head and neck, and wrapped a rope around her neck until she stopped struggling, the affidavit said.
The men threw one of her shoes into the woods and lifted her body, now dead weight, into the trunk, according to the affidavit.
As they drove to a lake where they planned to dispose of her body, Crosley used Wolfe's phone to send text messages, according to the affidavit.
When they got out at the rural Sullivan, Ind., location, Buskirk told police the men used a rope to tie Wolfe into a fetal position and attached the 20-pound weight to her body, but instead of landing in the lake, she hit a tree branch, causing a gash that made her bleed, the affidavit said.
Around 3:10 a.m., Crosley dragged her body to a ledge, threw it over a high wall into the lake and watched it sink, according to the affidavit.
Buskirk and Crosley are being held in the Greene County Jail without bond and face charges, including murder, confinement, conspiracy to commit rape and drug dealing.
At a preliminary court hearing today, a not guilty plea was entered for both men.
Attorneys for Buskirk and Crosley declined to comment to ABC News.