Police were called to two unexplained deaths in Thamesmead in three days just yards from one another.
A 52-year-old woman was found dead in her home in Malthus Path on Monday evening.
Police were called at 7.01pm and a spokesman confirmed the woman was deceased on arrival.
He said: "We are not treating the incident suspiciously. It is believed she had an underlying medical condition."
A spokeswoman for London Ambulance Service said: "We got a call at 6pm to reports of a person taken unwell.
"We sent a responder in a car and one ambulance crew. Extensive efforts were made to resuscitate the victim but sadly she died at the scene."
Police were also called at 11.47am on Wednesday to Ricardo Path to reports of another sudden death.
The man was in his 70's and was again "not believed to be suspicious" and is thought to have been dead for a few weeks.
A spokeswoman for London Ambulance Service added: "We were called at 11.50am on Wednesday to an incident in Ricardo Path.
"We sent a responder in a car and an ambulance. One person was found dead at the scene."
A 28-year-old woman living near the home told News Shopper: "I saw the ambulances on Monday and then again yesterday.
"A lot of the neighbours were looking out at what was going on all day because the forensics team in white suits were at the house all day.
"I was shocked when I heard what had happened.
"The police took the body away just before midnight.
"We heard he had been there for about six weeks, there were loads of flies in the house."