Another of several additional articles that may be helpful, with images of the ultrastructural comparison between apoptosis and necroptosis:
Ultrastructural observations of programmed cell death during metanephric development in mouse. Li X1, Guo M, Shao Y. Microsc Res Tech. 2013 May;76(5):467-75. http://www.ncbi.nlm.nih.gov/pubmed/23536536