Her body was found near the OneSpace community centre at Kidbrooke Park Road in the Royal Borough of Greenwich on Saturday.
Now investigators are desperately trying to find out why she was killed, if her attacker could strike again and if Ms Nessa knew her killer.
Here we take a look at some of the key unanswered questions so far:
Q: How could she be killed on a five-minute walk through what police believe was probably a busy park?
A: Even the cause of Ms Nessa’s death is unknown after a post-mortem proved inconclusive, but detectives believe some members of the public will have seen Sabina or her killer on Friday evening and could help solve what is so far a mystery.
Q: Was this a stranger attack?
A: This is unknown, but in the apparent absence so far of any clear leads that the crime was carried out by a person known to Ms Nessa police are not discounting this possibility and are mounting extra patrols.
Q: Is this tragedy part of a wider problem of violence against women?
A: Yes, because whatever the facts turn out to be, a young woman has died violently on a short evening walk that anyone should be able to complete in safety. Whether specific opportunities to prevent her killer striking might have been missed will only be known once the culprit is caught and the investigation and prosecution completed.
Q: Is there any sign of an imminent breakthrough in the investigation?
A: This is hard to say because detectives often keep details of their progress secret to avoid hindering their investigation. But today’s renewed appeal and the large number of officers deployed indicates that at least some important evidence is still needed. Although most murders are solved relatively quickly, that’s not guaranteed and will be harder if it does turn out to be stranger attack.
Q: Will Sabina’s killer murder again?
A: Hopefully not, but the Metropolitan Police are concerned it may happen. Detective Chief Superintendent Trevor Lawry said there was no intelligence to suggest a second murder would take place.
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