His bullet-ridden body was later found outside a hospital.
Shetewei was a supporter of the UN-backed Government of National Accord based in Tripoli, led by Prime Minister Fayez Serraj.
Libya has descended into chaos since the 2011 overthrow of long-time dictator Moamer Gaddafi.
The country is governed by three competing governments - two in Tripoli and one in the eastern city of Tobruk.
The Serraj-led government took over last year with international hopes that it could restore stability. However, it has been unable to gain recognition from rivals.
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Shetewei was a supporter of the UN-backed Government of National Accord based in Tripoli, led by Prime Minister Fayez Serraj.
Libya has descended into chaos since the 2011 overthrow of long-time dictator Moamer Gaddafi.
The country is governed by three competing governments - two in Tripoli and one in the eastern city of Tobruk.
The Serraj-led government took over last year with international hopes that it could restore stability. However, it has been unable to gain recognition from rivals.
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