ROSEMOUNT, Minn. — A mother and daughter died when a roughly 800-pound boulder fell off a truck and smashed into their car, and now that truck driver is in custody, according to police. Karen Christiansen, 67, was driving with her daughter, Jena Christiansen, 32, in Rosemount, Minnesota, Monday afternoon when the massive boulder dislodged from the back of the truck and crashed into their 2002 Toyota Avalon, the Rosemount Police Department said. The mother and daughter, both of Shoreview, Minnesota, died from blunt force head trauma, the Hennepin County Medical Examiner's office said. "My heart is broken," Jena Christiansen's boyfriend, Ryan Kilian, told ABC affiliate KSTP in Minneapolis. "She is the most amazing person I have ever met." After the crash, authorities turned to surveillance video to track down the commercial truck involved, according to KSTP. On Wednesday, detectives identified the commercial vehicle driver and owner as Joe Czeck, 33, of Hastings, Minnesota, police said. Czeck was arrested and declined to give a statement, police said Thursday. Charges are pending, police said, and he is being held in the Dakota County Jail.<doc-sep>US police have charged a man after a boulder allegedly bounced out of the bed of his truck and crashed into another car, killing two people.<doc-sep>The 800-pound rock crushed their car as they followed behind a commercial vehicle. A mother and daughter were killed when an 800-pound boulder fell off of a truck and hit their car. Karen Christiansen, 67, and daughter Jena Christiansen, 32, died in the freak incident on Rich Valley Road in Rosemount on Monday. The pair, who are both from Shoreview, died from blunt force head trauma "due to a motor vehicle mishap," according to the Hennepin County Medical Examiner's Office. They were traveling north on Rich Valley Road at 4:50 p.m. when the boulder came loose from a commercial vehicle traveling the opposite direction, falling onto their Toyota Avalon. Rosemount police are now investigating the incident, saying they have identified the company vehicle and the driver and will now seek to figure out how boulder came to fall from the truck. Jena Christiansen was a general manager of several Red Lobster restaurants, according to her boyfriend Ryan Kilian, who released a statement to WCCO on Wednesday evening. "She is the most amazing person I have ever met," he wrote. "She was so smart and beautiful. She made me the man I am today I would be nothing without her."<doc-sep>MINNEAPOLIS (WCCO) — The driver of a truck that dislodged an 800-pound-boulder that killed a mother and her daughter has been arrested. Joe Czeck, 33, did not stop at the scene of the accident in Rosemount on Monday. As WCCO’s Kate Raddatz shares, the tragedy is a reminder to drivers to secure your load. It took four fireman just to roll the boulder. It’s the same rock that police say came flying off Joe Czeck’s dump truck Monday. He was heading south on Rich Valley Road in Rosemount. “It’s evident to us that it was not secured in the back of the vehicle,” Rosemount Police Chief Mitchell Scott said. Karen Christiansen, 67, and her 32-year-old daughter Jena were headed north on the road. The truck went over a railroad crossing and the boulder came off, tumbled and struck the family’s car. The women died at the scene. “It’s very traumatic for the families. We don’t see this type of accident every day,” Scott said. Investigators figured out the truck, shown here in this photo taken shortly after the accident, belonged to Czeck Services, which lead them to the driver. Rosemount Police Chief Mitchell Scott says the tragedy is a reminder of the law. “You’re required by law to have whatever you are hauling secured in your vehicle. So if you have a lawn mower or an ATV, UTV inside, you are responsible to make sure it’s secure,” Scott said. Even if an accident doesn’t occur, drivers can still be pulled over and given a ticket for unsecured loads. “Things happen out of our control all the time, so take the extra time to make sure things are secure,” Scott said. Czeck is being held at the Dakota County Jail. Charges are still pending.<doc-sep>
A mugshot of Joseph Paul Czeck from the Dakota County Sheriff's Office. Dakota County Sheriff's Office A mother and daughter from Minnesota were killed by a 600 to 800-pound boulder when the rock fell from a truck in front of their vehicle and crashed into their car.Karen Jean Christiansen, 67, and her daughter Jena Helene Christiansen, 32, died while traveling in Rosemount, Minnesota on Monday around 4:40 p.m.On Wednesday night, the the Hennepin County Medical Examiner said the official cause of death for both was blunt force head trauma due to the crash. According to Rosemount Police, it took more than four firemen to roll the boulder at the scene. "If you tried to duplicate this millions of times, I don't think you'd be able to do that. I think it was a very unique situation," said Rosemount Police Chief Mitchell Scott.After the crash, authorities used business security cameras to capture a picture of the truck, which was a commercial vehicle. The driver of the truck was identified as Joe P. Czeck.According to a press release, Czeck was arrested by Rosemount Police on Wednesday, July 11, and is currently being held in the Dakota County Jail. "We had a connection like no other... my heart is broken... the world has lost an angel," Jena's boyfriend Ryan Kilian told KSTP Kilian said Jena worked as a general manager for several Red Lobster restaurants in the area.According to KSTP, shortly before the accident, Karen met with former coworkers at Dakota County Technical College.A family friend told KSTP, "Karen was a sweetheart of a lady."