The body of James Maina was pulled out of his car on Sunday at Thiba River.
He was reported missing on April 21, while driving along Mwea-Embu road.
The family made a public appeal on social media groups to help trace him.
"Hey guys. So I know I haven’t been 100% myself this past week and it’s because my dad has been missing since April, 21 2018. We tried to stay positive and deal with this quietly but we need your help. Please share the poster above and the car and any information you can share will be highly appreciated," she wrote.
Maina was a businessman dealing with export of horticultural produce. He leased farms in different part of Embu and Kirinyaga where he planted horticultural produce.
A section of the family suspect foul play in his death.
After months of sending out an appeal, Joyce penned a heart-wrenching message:
"Words can’t even explain how much my heart is breaking not having you with us today #happyfathersday"
A police report from Embu police said a mobile phone and cash estimated to be between Sh 10,000 and Sh 20,000 were found in the dead man’s pockets.
Detectives from the Special Crimes Prevention Unit had been assigned to trace the lost man.
An officer who spoke to the Star but requested for anonymity said the man’s body was badly disfigured after staying in water for four months.
Police said they were yet to find any indications that Maina may have been killed.
Joyce announced the sad news on her Instagram.
"Dear friends, family and fans. My dad's car and body was found at the bottom of a river in Embu yesterday. It heart breaking news but we've been praying for some kind of closure for month. When I blew out my birthday candle last week that's actually what I wished for..."
"I kindly ask that you give me and my family space as we make funeral arrangements. I will share details on the place and time for those interested in attending the meetings I can't thank you all enough for your prayers as kind words throughout this difficult time God bless."