Kenya has been left in shock after the killing of a senior lawyer in a drive-by shooting on a busy street in the capital Nairobi. Mathew Kyalo Mbobu, a respected lawyer and former head of a political parties' dispute tribunal, was driving home on Tuesday evening when a gunman on a motorcycle pulled alongside his vehicle and opened fire. Witnesses on the Lang'ata/Magadi road reported hearing multiple gunshots. The motive for the attack, which resembles the shocking killing of a lawmaker earlier this year, is unknown. Investigations are underway. The Law Society of Kenya has described the killing as 'abhorrent' and said the crime must be 'dealt with swiftly and conclusively'. It expressed concern over threats faced by lawyers, adding that the killing had 'all markings of a predetermined assassination'. LSK president Faith Odhiambo stated, 'Too often, advocates have been victimised and targeted for the work that they do.' A gruesome video shared online shows a shattered car window with the bloodied, lifeless body of the lawyer slouched over the steering wheel. Senate Speaker Amason Kingi said the 'cold-blooded killing' had 'left us all devastated and in deep shock'. He expects the police to carry out speedy investigations to uncover the reason and culprits behind this heinous crime. In a similar incident earlier this year, MP Charles Ong'ondo Were was shot dead in a targeted attack in Nairobi. Some suspects have since been arrested and charged in connection with the case.