A man in his 20s was found with significant injuries in a garden on St Catherine’s Grove in Lincoln.
Police believe he visited a home on the street earlier in the night, before he was found in a garden at around 3am on Sunday, December 3.
Officers said he suffered significant injuries to his body.
Police arrested three people in relation to this incident and they remain in custody.
The young man is described as wearing a dark coloured hooded North Face top and navy blue Superdry jogging bottoms with an orange tab on the rear pocket. He also had on blue Air Max training shoes.
Lincolnshire Police are appealing for anyone who saw the man described in the area between midnight and 3am or anyone who may have information that can help with the investigation.
Call 101 quoting incident number 101 of 3 December 2017 with any information.