No, this murder was never solved and nobody was ever charged. There were suspicions who was responsible and an anti zionist group was suspected. If you have any info, I would be interested as I knew one of the victims.
Some of you guys are understanding the difference between solved, and having enough proof and evidence to arrest and charge someone. All solved means, is they basically know who did it.
They know the son is in one way or the other responsible for it.