Mark Wright struck a 54th-minute winner to hand Crawley victory at basement outfit Tamworth.
Steve Evans went close before Wright produced an outstanding 18-yard strike into the top corner to plunge Tamworth deeper into the relegation mire.
Tamworth should have equalised when Crawley goalkeeper Ben Hamer fouled Steve Burton inside the 18-yard box.
But the Lambs' misery was complete when Taiwo Atieno's 79th-minute penalty was denied by a fine Hamer save.
Tamworth: Veiga, Law, Laight, Friars, Storer, McGrath (Price 48), Heslop, Atieno, Edwards (Burton 69), Stevenson (Williams 84), Weaver.
Subs Not Used: Dale Belford, Kemp.
Crawley Town: Hamer, Hiley, Woozley, Bull, Wright, Judge (Scully 46), Steve Evans, Bulman, Okuonghae, Rendell, Blackman (Benyon 14).
Subs Not Used: Tolfrey, Richardson, Macleod.
Booked: Benyon, Hamer.
Goals: Wright 54.
Ref: L Hodgson (Nuneaton).