A man has been arrested on suspicion of causing death by dangerous driving after a pedestrian involved in a motorbike crash was "left to die at the side of the road".
Greater Manchester Police (GMP) said the family of 67-year-old Jacinto "Jack" Cabrera, from the Fallowfield area, are "absolutely devastated to have lost Jack in such a tragic and senseless way".
He was hit while walking along Rowlandsway, Wythenshawe in south Manchester, on Friday afternoon.
The rider fled, immediately abandoning his stolen motorbike and ran off down Wavell Road.
He had been travelling alongside another motorcyclist, who also fled the scene.
Police were called on Friday at 1.45pm and found that Mr Cabrera, who was known as Jack, had suffered a serious head injury. He was taken to the Salford Royal Hospital but later died.
Sergeant Mark Thomas, of GMP's serious collision investigation unit, said: "This is just the start of our investigation and we will not rest until we have identified both riders involved."
A 22-year-old man was arrested on suspicion of causing death by dangerous driving on Saturday by officers from the Wythenshawe Neighbourhood Policing Team. He is still in custody.
GMP said the rider of the abandoned motorbike had been described as being white, 19 to 20 years old, of a skinny build and wearing a navy blue jumper, dark blue or black trousers and dark trousers. He was wearing a blue balaclava with ski-style goggles underneath.
The abandoned bike was a dirty and rusty maroon-coloured Kawasaki 500cc.
The second rider was not wearing a helmet and his bike was red and white.
Mr Thomas said: "Sadly, Jack has now died as a result of the serious head injury he sustained during the collision.
"Our thoughts are with his family at what is understandably a very difficult and emotional time for them and we will continue to offer them whatever support they need over the coming days and weeks."
Mr Cabrera's family have been asked to be left alone to grieve in peace.
Mr Thomas said: "This man was left to die at the side of the road, and his family are absolutely devastated to have lost Jack in such a tragic and senseless way. I would therefore continue to ask anyone who has information about what happened, or who may be responsible, to call us.
"I also want to make a direct appeal to the second rider to also do the right thing, for the sake of yourself and Jack's family, and come forward.
"If you do know who is involved and you are covering for them, please think how you would feel if this was a loved one of yours. You would be heartbroken and desperate for answers so please, search your conscience and tell us what you know, in confidence if needed."
Anyone with information is asked to call police on 101 or Crimestoppers, anonymously, on 0800 555 111.