SAN ANTONIO -

A second baby in a set of quadruplets born prematurely last month in San Antonio has died.

The funeral for Ryan Nico is expected to be held Thursday, just seven days after his death.

The four boys -- rare sets of identical twins -- were born Jan. 15 to Khristian Rohena and Shontae Minor at Saint Luke's Baptist Hospital.

The first boy died on Jan. 24.

The largest of the babies weighed only 2 pounds, 7 ounces.

The smallest was 1 pound, 15 ounces.