A 25-year-old man from south east London has been charged with the murder of Dean Edwards who was shot in the back of the head in Betts Park.
Taylor Purdy will appear via video-link at a court to be decided on Tuesday, the Metropolitan Police said.
He was about to leave the park when he was fatally shot, and detectives believe he was killed in a case of mistaken identity.
Mr Edwards was a popular father of four and grandfather of six.
His daughter, Hollie Edwards, 21, said: “”Our dad was a friendly, bubbly and loving person.
“He was never confrontational and hated arguments, he was a big softie at heart, loved all the grandchildren and spoiled them.
“He was a good, innocent person.”
Speaking after Purdy had been arrested, senior investigating officer Detective Chief Inspector Kate Kieran, said: “This is a major development in our investigation and we will continue to work hard to make sure that those who are responsible for Dean’s death are brought to justice.
“Dean’s death is a tragic reminder that carrying a gun has devastating consequences and I continue to plea to anyone with any information to come forward either by calling police on 101 or Crimestoppers anonymously.”