Hyunsoo O'Callaghan, born in South Korea in 2010, was killed by his adoptive father Brian O'Callaghan, in 2014, just four months after he was adopted, a National Security Agency worker.

The statue depicting a boy holding a butterfly is a replica of the same sculpture installed in April this year at the Daniel School, a school and orphanage for children with disabilities, in southern Seoul. Thomas Park Clement, a sculptor and a Korean-American adoptee, and his wife Kim Won-sook made the matching sculptures.

On the website, the US school said the two schools "share a meaningful connection through their work of providing special education programming for children with disabilities. To mark this new partnership, both schools received a donation of matching sculptures" from the couple.

As a result of plea-bargaining over a trial process that had stretched for more than two years, O'Callaghan pled guilty to first-degree murder and child abuse for the death of his own son in exchange for having his first-degree murder dismissed. He is now serving a jail term of 12 years. (Yonhap)