A second man has been arrested on suspicion of murder after an 80-year-old grandmother was found strangled to death in an allotment in north London.
Ghanaian national Mubarick Duat, 37, was detained and taken to a south London police station for questioning following an appeal to trace him.
A 40-year-old man was also charged in March with the murder of Lea Adri- Soejoko.
Ms Adri-Soejoko, who was strangled with the cord of her anorak, was discovered in a lock-up store at the Colindale allotment on February 28.
She was secretary of the Colindale Allotment Garden Association and had failed to appear for a meeting the previous evening.
DCI Noel McHugh, said: "I am still keen to speak with those who were in and around the area at the time of the incident. It is important that we continue to build a timeline of the events that led to officers discovering Lea's body in the lock-up store.
"I would also like to hear from any previous owners who may be able to provide us with information about the people who currently tend to or own an allotment. I would encourage anyone who visited the area on Monday, 27 February and has not spoken with police to phone us.
"Any piece of information, however small, will help my team build a picture of events that tragic day."
Ms Adri-Soejoko’s family said: "What is keeping us going is the hope that we will find out the truth about the callous death of our kind and loving mum.
"We need your help, the public, to support us now by assisting the investigation and helping to shed light on Mum's final hours."
Anyone with information is asked to contact the incident room on 020 8785 8099, or police via 101 or @MetCC.
To give information anonymously call Crimestoppers on 0800 555 111 or visit crimestoppers-uk.org.