Winona Mom's Disappearance Was 'Involuntary' And 'Suspicious': Police

WINONA, MN — The disappearance of Madeline Kingsbury — a Winona mother of two who went missing late last month — is "suspicious" and was likely "involuntary," according to police.

Kingsbury, 26, hasn't been seen or heard from since dropping her kids off at day care on the morning of March 31. She also did not show up for her job as a research coordinator at the Mayo Clinic.

Calls and messages from her sister and mother went unanswered. "All of this is extremely out of character for her," Winona police said.

Megan Kingsbury told FOX News she received a "goofy" text from her sister at 8:15 a.m. on the morning she went missing.

"We were chuckling about a funny photo exchange between us, and that was the last communication with me, or with any of my family or her other friends," Megan Kingsbury told the news channel.

Kingsbury's van, a 2014 dark blue Chrysler Town and Country, is also missing.

During the investigation, police learned that a van matching Kingsbury's Chrysler was seen traveling from Winona to the eastern part of Fillmore County on the day she went missing. It's not clear who was driving the vehicle.

Large, organized search efforts for Kingsbury continued through Easter weekend. Approximately 1,900 volunteers came out Friday and 700 Saturday to help in the search, according to authorities.

"Due to this incredible turnout, we were able to cover substantially more ground in a shorter time than expected," read a statement from Winona Police Department.

Authorities asked residents and landowners in the area to check their properties — including any surveillance footage — for signs of the van passing through or stopping in the area or anything else suspicious.

Kingsbury was not located, and there are currently no suspects or persons of interest.

"We are not giving up and we want to thank everyone for their continued support for Maddi and her family," the police added.

A public Facebook group was created to aid the search for Kingsbury. Her family is offering a $50,000 reward for information that leads to her location.

Kingsbury is described as 5 feet, 4 inches tall, weighs 135 pounds, and has brown hair and hazel eyes. The Winona Police Department and Minnesota Bureau of Criminal Apprehension "are actively reviewing and following up on information obtained during the ongoing investigation."

Anyone with information on Kingsbury's location is urged to call 911 or the Winona Police Department at (507) 457-6288.