Morgan Arnold, 14, and her 19-year-old boyfriend Jason Bulmer were arrested on Sunday and accused of conspiring to kill her father, Dennis Lane.
The couple planned to stab Lane 10 times in the throat and Denise Geiger, Lane’s girlfriend, 15 times. Lane promised to run away with Bulmer afterward.
"I have my reasons and I'll tell you later," Arnold wrote to Bulmer, responding to her boyfriend’s questions of why and how Lane should be killed. "I don't know what I'll do if you don't do it tonight,"
Before going to bed, Arnold left the sliding glass door in her basement open. At 4:20 a.m., Bulmer slid through the door, snuck upstairs into Lane’s bedroom and stabbed the man to death.
Geiger called police immediately, and the couple was arrested. Police plan to charge them with first and second-degree murder, including conspiracy to commit murder.
The news shocked Ellicott city residents, who believed Arnold and her well-liked father were close.
According to Ellicott city police, the two had conspired electronically for two months. They often exchanged pictures of knives in an effort to acquire a satisfactory weapon.
Lane was a realtor, blogger and podcast co-host who was well known in Howard County. He was described as an unofficial county council member, whose opinion was highly valued.