UPDATE AT 3:30 P.M.: The Sanborn County Sheriff's office says Willman and Beem have been located and are with friends.
South Dakota authorities are looking for two people missing from Sanborn County.
The Sanborn County Sheriff's Office says Sheila Willman was last seen at Lake Prior in Woonsocket Sunday evening. The 77-year-old woman has white hair and wears glasses. She is 5 feet tall and weighs 95 pounds. Willman does have a heart condition and it is unknown if she has her medication.
Authorities say Willman could be traveling with 56-year-old Brian Beem. He was last seen in Wessington Springs at 1 p.m. Sunday. Beem is 5'10" and weighs 155 pounds with curly, black hair. Deputies say Beem's vehicle is still in town but they aren't sure where he is at this time.
At this point, law enforcement have not released photos of either Willman or Beem.
If you have information about either person, you are asked to call the Sanborn County Sheriff's Office at (605) 796-4511.