The current façade dates back to 1891 and was designed by the local engineer Pasquale Saetta. It develops over three orders in eclectic style and is characterized by the use of cement tiles with dark red marble chips, probably produced by the Falzone Brothers, active in the city since the late 19th century.
The entrance portal is flanked by paired columns with a triangular pediment, a feature repeated on the upper levels. The second order opens with a mullioned window, while the third houses a niche with the statue of Saint Sebastian. A curved pediment crowns the façade. The sculptures placed in the niches and along the cornices are works by the sculptor Biangardi. The current bell tower, built on the remains of the 18th-century one, ends with a polygonal loggia.
The interior has a single nave with a barrel vault with lunettes, decorated with Neoclassical stuccoes and Ionic pilasters. On the main altar are the statue of Saint Sebastian, attributed to Stefano Li Volsi, and a painting of the Madonna of the Agonizing, the work of painter Tommaso Pollaci.
During the 2005 restoration works, carried out by the Superintendency of Caltanissetta, a crypt with “seat-shaped” drainage channels was discovered, evidence of the church’s ancient funerary use.