A 67-year-old man has died after a collision with a motorbike in Wythenshawe.
Police have named the man as Jack Cabrera from Fallowfield.
A 22-year-old man has now been arrested on suspicion of causing death by dangerous driving and remains in custody for questioning.
At about 1.45pm on Friday 19 June 2015, police were called to Rowlandsway in Wythenshawe following reports a pedestrian and motorbike were in collision.
Officers attended and found the man had suffered a very serious head injury.
A 16-year-old boy is believed to have stayed with Mr Cabrera at the scene until emergency services arrived.
Mr Cabrera was taken to the Salford Royal Hospital for treatment but has now died as a result of his injuries.
The rider of the motorbike abandoned the bike immediately following the collision and ran off on foot.
A stolen Kawasaki 500cc motorbike was found abandoned at the scene.
On 20 June 2015, officers from the Wythenshawe Neighbourhood Policing Team executed a warrant at a house and a 22-year-old man was arrested on suspicion of causing death by dangerous driving. He remains in custody for questioning.
Sgt Mark Thomas, from Greater Manchester Police’s Serious Collision Investigation Unit 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.
“As a result of our public appeal, we have been inundated with information from the public and as a result, we have now arrested one man who remains in custody for questioning. I would like to thank the public for ctheir assistance but this is just the start of our investigation and we will not rest until we have identifed both riders involved.
“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 the independent charity Crimestoppers, anonymously, on 0800 555 111.