- 4 updates
The killing has shocked neighbours in the residential street, which is located on the outskirts of Colchester.
A number of homes were sealed off on Sunday as police searched for clues.
Empty bottles of vodka and cans of lager could be seen strewn across the front gardens of properties in the street.
Marie Partner said a woman and her teenage daughter, who were hosting the party, had spoken to neighbours on Saturday to apologise in advance for any extra noise.
Ms Partner, who has lived in the street for nine years, said:
Senior investigating officer, DCI Simon Parkes, said:
The victim, who is from the Clacton area, has not yet been named by police.
However, tributes began flooding onto the social networking site Twitter using the hashtag #RIPJay.
One Twitter user, under the name Mary-Ellen1, said:
Detectives have launched a murder investigation after a teenager was stabbed to death in Essex.
Officers were called to reports that a 17-year-old boy had been stabbed during a disturbance outside a house in Marlowe Way, Colchester, at around 10pm on Saturday night.
He was taken to Colchester General Hospital with abdominal injuries but died shortly after arriving, Essex Police said.
Two people have been arrested in connection with the incident and are being questioned at a north Essex police station.