After his arrest, Jayamaha was indicted in the High Court of Colombo for
murder and was tried before a judge sitting without a jury. On July28, 2006, he was instead found guilty of
culpable homicide, for which he was sentenced to 12years of
rigorous imprisonment and fined 300,000Sri Lankan rupees. The prosecution, through investigation and forensic data, were able to reconstruct the events surrounding Yvonne's murder.
Night before the murder On June30, 2005, at 8:30p.m., Yvonne and Caroline picked up Jayamaha from his home in Bagatale Road in Roger Jonsson's vehicle, in preparation for a night of bar-hopping. The group travelled back and forth between the White Horse Inn, located on Nawam Mawatha, a bar known as Glow, located in the building of the Automobile Association of Ceylon, and The Blue Elephant at the
Hilton Colombo. The group then returned to the Hilton, where they remained for only 10minutes before reclaiming Yvonne's car from the valet. Caroline alleges that at some point during the night she had argued with Jayamaha, after which Yvonne blamed him for Caroline's emotional distress. However, Jayamaha's legal counsel maintained that the argument had begun over Caroline talking to an individual named Pavithra, and that Yvonne had taken Jayamaha's side. Yvonne returned to Glow with a friend shortly thereafter. Caroline and Jayamaha returned to the Jonsson's condominium by cab, arriving at 2:02a.m. on the morning of July1st. Upon arriving in her parents' condominium on the 23rdfloor, Caroline misinformed her parents that she had returned with Yvonne. Caroline and Jayamaha then briefly stayed in Caroline's room, where Caroline made a phone call to Yvonne's friend to inquire about her. Jayamaha maintained that he and Caroline had sex in her bedroom, whereas Caroline alleged that they argued again. Jayamaha hired a taxi over his phone before leaving the condominium between 2:20 and 2:30a.m
Murder of Yvonne Jonsson Yvonne returned to the Royal Park Condominium complex at 2:50a.m. The attack began after Yvonne exited the elevator on the 23rdfloor. Jayamaha forced Yvonne to the staircase, leading Yvonne to drop articles of clothing in the ensuing struggle. Jayamaha then bashed her head against the edge of a step several times. Yvonne had been dragged down four flights of stairs and was found on the steps of the 19thfloor. The cause of death was determined to be asphyxiation by a pair of stretch pants worn by the deceased, which had been fashioned into a ligature by bending the victim's legs backwards. A partial palm impression in blood matching Jayamaha was found on the banister near Yvonne's body.
After the murder Jayamaha confessed to bathing in the pool at Royal Park after the murder to wash off evidence of the murder from his person. Jayamaha's taxi arrived between 3:25 and 3:30a.m., along with his friend, Shafraz Rilvan Mohamed. The driver of the taxi and Mohamed later independently testified that Jayamaha appeared dressed only in a pair of boxer shorts and shirt, carrying a pair of folded trousers, with no visible blood on his person. Caroline alleged that after the morning of July1st, Jayamaha deviated from his habitual and frequent contact with her. She received no phone calls from him for the next one and a half days, despite usually receiving several calls from him daily. Jayamaha also did not visit Caroline until the 2nd of July. == Failed appeal and death sentence ==