Patrick Muiruri, who is a friend of slain Dutch business tycoon, has told the media that Mr Cohen felt unwanted during his daughter's wedding.
The wedding was conducted at Cohen's Kitusuru home.
He was sidelined from the program with his attempts to address the guests being rebuffed.
"I noticed that Cohen was nowhere neither appreciated during his adopted daughter's wedding, " Patrick told the media after the tycoon's rotting body was discovered in a septic tank.
The prime suspect in what the Directorate of Criminal Investigations (DCI) say is a grisly murder is Sarah Wairimu, Tob Cohen's wife.
Phillip Murgor, who is representing Wairimu, has maintained that his client is innocent even as detectives say she is guilty.
DCI sleuths had pitched camp at the couple's Kitusuru mansion looking for crucial leads that might help solve the murder puzzle.
A judge presiding over the high profile case has ordered that Wairimu be subjected to a mental examination.
The murder case has gripped the Kenyan public as a section of social media users call on justice to be served.
Forensic experts are on the case helping the prosecution piece together the evidence.
Prosecution lawyers maintain that they have massive evidence to convict the prime suspect.