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She said the family is left with more questions than answers despite being put through a painful experience during the exhumation.
"I'm saddened, shocked and unhappy that the DCI has made no arrest and that the investigation has taken long but no one knows what happened. I'm not sure how my son who was allegedly intoxicated was able to move to a window of a strange house and jump from the 12th floor to his death," she said.
Mwathi's father Peter Kirumba said the family has not been given a hard copy of any of the postmortem report, raising more questions.
"We are still hearing about a DJ, meaning he knows something but he and his friends have not been arrested and we wonder why," said Kirumba.
Mwathi's aunt Tabitha Wangui said she was surprised at how postmortems of other incidents including Shakahola had been quickly handled, but Mwathi's had been delayed.
The reaction comes even as DCI forwarded Mwathi's file to the Director of Public Prosecution (DPP) for further action.
The report showed that although Mwathi's cause of death was inconclusive, there was a possibility of suicide as none of the suspects could be linked to the death.
The DCI added that no forensic evidence suggested that the late designer was murdered.
A second postmortem done on March 31 showed that Mwathi died due to severe head and limb injuries.
Chief government pathologist Johansen Oduor indicated Mwathi had fractures on the upper and lower limbs as well as on his neck.